/*
 * Copyright 2013 Glassy Cinema.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package hu.glassy.model.common;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import org.springframework.data.domain.Sort;

/**
 * The parent class of every model object
 *
 * @author molnar.alexander@sonrisa.hu
 */
@MappedSuperclass
public abstract class AbstractEntity implements EntityInterface
{

  public static final Sort SORT_BY_ID_ASC = new Sort(Sort.Direction.ASC, "id");

  @Id
  @Column(name = "id")
  @GeneratedValue(strategy = GenerationType.AUTO)
  protected Long id;

  /**
   * @return the id
   */
  public Long getId()
  {
    return id;
  }

  /**
   * @param id the id to set
   */
  public void setId(Long id)
  {
    this.id = id;
  }

  /**
   * ID-ból generált hash kód
   */
  @Override
  public int hashCode()
  {
    return getId() == null ? 0 : getId().hashCode();
  }

  /**
   * Objektumok osztálya és IDja alapján történő összehasonlítás
   */
  @Override
  public boolean equals(final Object obj)
  {
    // referencia
    if (this == obj)
    {
      return true;
    }
    if (obj == null || getClass() != obj.getClass())
    {
      return false;
    }

    final AbstractEntity other = (AbstractEntity) obj;

    if (getId() == null)
    {
      return other.getId() == null;
    }
    else
    {
      return getId().equals(other.getId());
    }
  }
}
